About the icons: Original book looked best: we have lots of pixels, why not use them? The icon has a non-standard shape, making it easy to spot. Or if you actua

About the icons: Original book looked best: we have lots of pixels, why not use them? The icon has a non-standard shape, making it easy to spot. Or if you actually need to have icon-shaped outlines, top-right one is beautiful, too. Although the shading should perhaps be removed if some OSs have their own shade logic for the whole images.